1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5317a7b9a2b76a1f71ff9e2117445bd580dc18d23ee6803f20bc558dc742c6a. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e82c79a1-6dae-48c0-87a0-be31cf963936.json and https://artists.proofprofile.net/proofs/artist/e82c79a1-6dae-48c0-87a0-be31cf963936.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af1166a1892297f6cdde9064cdb1699e132ae420aff37a358674ef8e5ec2b7a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x295dff4b5a21073e695fcabce97f52b24f60d2026dfdc285cc32346423b6bce8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ba9bdd8cf0a60f3dbcc40e04512191e5e832eeeafe2f9af0ff5b7383ff10d0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb801b596a70a0246049d105f928cce27ed9fed24fcc0f8285cc21d15eccdcd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25a58865bda92a87cb253bddf9d97ea8e413731deacc0b5246b47d81eefac07. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d852e895b9c5a6d4a51936f203fb721866124abe996aeb052d4428f622245b. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c4c102d7b909e69690b44cac44964fa99976fce29cd75aaa29fb5d283b307d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4ea3be25fbc175743429245f3c2d9321d4871a0618b7befb2d308831ce099c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USL4Q1919686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c7b9147a1faab9eea557d04dd63c9de483ad0b1cf0efa9a5b62a7c1ca0201a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9aac8b09a790aa402c49c2afadb19a192a31d3979e591075413bae2c394bebf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3976b5fd713ba386a9768bd5efa5781a3b5479fcfc3c9360beefbaa1142de67c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0cdd836b453eabe53f1567da49d42907a230501451941995ad1eaed69bfdeb. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2badbfb3443777f5966c3c8f366a588ac2e5b6c444479afeb3c8b81da771267. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b764bff4ce442b6fc02e43f012e89131c9b0d7d735e5fbbc9d54e174ca1088. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc640b488ae2c6896946c43101ec3007bf7fe751a33652145ba5123a2ffe8b938. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDY42320257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7102e2d1e02d021f492cd7e25d7babd4093ad5cbb81111ed871fa5390a001663. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USMH92333039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2084425bebe3ebbea6461adeb2f4ee1d7037e211dc1f6628032a90112eaa0d67. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USMH92333042.